Testing device



Patented June 14, 1927.

I UNITED vSTATES,

PATENT OFFICE.

ROBERT E. WILSON, OF CHICAGO, ILLINOIS, AND WILLIAM H. IBA'HLKE, OF WRITING,

INDIANA, ASSIGNORS T0 STANDARD OIL COMPANY, 0F WRITING, INDIANA, A COB- PORATION OF INDIANA.

. TESTING DEVICE.

Application led January 5, 1925. Serial No. 722.

This invention relates to improvements in testing devices and will be fully understood from the following description, illustrated by the accompanying drawings, in which:

Figure 1 is a sectional view'of the testing device. in a suitable container` and Figure 2 is a. diagrammatic view illustrating a method in which the device is employed.

In accordance with the present invention, we'. provide a hydrometer for testing gasoline or other petroleum oils and distillates, said hydrometer being provided with a thermolmetric column so proportioned that the rate of fall of the hydrometer with changes in temperature of the oil is'substantially the same as the rate of rise of the thermometric column. Such a hydrometer may be so calibrated in connection with an oil having a certain Baume or American Petroleum Institute gravity at a predetermined temperature as to sink in such oil until the level of liquid is opposite thetop of the thermometric column, regardless of the temperature of the oil.

Referring to the drawing, the numeral 5 indicates a hydrometer having an enlarged bulb 6 provided with a stem 7, the bulb containing the necessary weights 8. Sealed to the bulb 6 is a thermometric bulb 9 having a stem 10 which rises within the hydrometer stem 7, the bulb 9 and stem 10 containing a liquid 102L having a substantially uniform rate ofexpansion with rise in temperature, such as toluol, cresol, or the like. The volume of the thermometric liquid and the diameter of the thermometric stem are so proportioned with respect to the weight,

column and stem size of the hydrometer that the rate of sinking of the hydrometer with change of temperature in aliquid of a certain A.4 P. I. gravity at, say, F. is substantially the same 'as the rate of rise of the thermometric column.

Thus, a hydrometer constructed in accordance with the presentk invention, and which comes to equilibrium with the thermometric column at the level to which-the hydrometer sinks in a liquid of 56 A. l?. I. gravity at 60 F. has the following specifications:

Volume of hydrometer to highest scale mark, 100 cc.; volume of hydrometer to lowmometer is so proportioned with respect to the volume of the thermometric liquid that the expansion ofthe liquid for a predetermined rise in temperature is indicated by In such a hydrometer the bore of the thera linear rise of its level equal to the change in level of the hydrometer caused by the change in density of the liquid with the same temperature change. Thus, with the above hydrometer a change in temperature of 9 F. causes a change of 1 A. P. I. in the density of the liquid, indicated by a space of 1.25 cm. on the hydrometer stem. With the same temperature cha-nge, the level of the thermometric column rises 1.25 cm.

In Fig. 1, a. hydrometer 5, as described, is suitably confined with a well or cylinder 12 having perforated walls, the cylinder being located within a chamber 13 provided with a vertically projecting portion 14 of `glass or other suitable transparent material, into which the stem of the hydrometer projects. As shown in Fig. 2, the chamber 13 may suitably be in a by pass in a. condenser or rundownline 15 from a still such as a Burton type pressure still. A trap 16-is placed in the line k15, and liquid flows from the trap.

16 through line 17 to chamber 13; thence through line 18 tothe receiver 19, to which the line 15 leads. A line 20 connects the upper portion ofthe projecting member 14 of the chamber 13 with the vapor space of receiver -19.

Although the invention is described herein more, particularly as applied to oils, which are in general lighter/than water, it will, of course, be understood that the invention may be embodied in a device suitable for use in other liquids, lighter or heavier than water,

having a substantially constant rate of eX-,

pansion.

Claims:

1. A hydrometer 4 for oils comprising a thermometer the liquid of which extends up the stem 'of the hydrometer, the level of the thermometric liquid coinciding with the oil level when the hydrometer is immersed .in an oil of a predetermined specific gravity at :t predetermined temperature, the hydrometer and thermometer being roportioned relatively one to the other so tlat a change of temperature eects an equal and opposite movement of the hydrometer and the thermometric liquid level.

2. In en oil condensing system, a rundown line for condensed products, a receiver connected thereto, a trap in said run-down line, a'cha-mber, a hydrometer in said chamber comprising a, thermometer so propor.

stantially equalto the rate of rise of the y thermometric column, the condensate and` thrrnometric liquid levels being the same foran oil of said predetermined specific gravity, whereby the relationship of the specific gravity of the liquid in the chamber to that of the liquid of predetermined specic gravity is indicated, a liquid line connecting the trap to said chamber, a. liquid line connecting the chamber to thereceiver,z1n l u line connecting the to of the; chamber to the upper portion oft e receiver. f

ROBERT E. WILSON. WILLIAM H. BAHLKE. 

